Question: At the point in time 1978-0-2, what was the population of Hungary?
Paraphrase: What was the population of Hungary in 1978?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q28 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1978')) }